Practicing device for learning telegraph and radio codes



Nov. 20, 1923. 1,474,534 -A LINDSTEN PRACT1CING DEVICE FOR LEARNING TELEGRAPH AND RADIO CODES Filed Jan. 51. 1923 9/ yo 3r his Arron/rm Patented Nov. 28, 1923.

ii El) ST ALBIN LINDSTEN, or WHITE BEAR LAKE, MINNESOTA.

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I rnAoTIcING'nEvIoE roe LEARNING TELEGRAPH AND RADIO cones.

Application filed January 31, 1923; Serial No. 616,102.

and State'of Minnesota, have invented cerf, taln new andjuseful Improvements in l?rac-,

ticing Devices forLearning Telegraph and Radio Codes,-of which the following is a specificationf I i I My invention relates to code instructing devices for use by students in'telegrahy in general but especially for those studying radio telegraphy. The main object is to provide an efficient outfit for students to practies on and thereby easily memorize the different codes and signs usedin the different code systems and'to this end I furnish several codes with the device and arrange them and the instrument compactly in a cabinet handy to carry and place upon any suitable support.

In the accompanying drawing:

Fig. 1 is a side elevation of my device with one side of its cabinet removed and the hinged front end or door unfolded as when in use. r

Fig. 2 is a top view of Fig. 1 with. theside of the cabinet restored but the top and some interior parts omitted.

Fig. 3 is a front elevation of the cabinet looking into it, the door being removed from its hinge members 9, the top handle 7 in Fig. 1 being also omitted.

Referring to the drawing by reference numerals, 5 designates a cabinet having a fixed top 6 with a handle 7 by which to carry the device. The front of the cabinet is open and provided with a door 8 having its lower end attached by hinges 9 to the bottom 10, and

has its upper end provided with a suitable locking means, which in the present drawing consist-s of a staple 11 for a padlock '12 to engage in and hold upon the staple a vhasp 13 which is hinged at 14 to the top 6. The line 15 represents the top of a table or other support for the device.

Fixed upon the inner side of the door 8 is a buzzer 16 and an electric switch 17 having a push button 18. Housed in the cabinet. is a source of electricity which may be dry batteries 192'O, placed either vertically or horizontally, and connected together by a wire 21 and in circuit with the switch and the buzzer by wires 22, 23, 24 and 25, the current running as indicated by the arrows near said.

wires, or in any other suitable'arrangement of the circuit. In the arrangement shown the current .runs from battery 20 to the switch and when the switch button is pressed so the switchclosesthe current runs over wire 24,110 the post 260f the buzzer and after operating the buzzerit runs from post 27 over wire 25 to the battery19] I H Infront. of theibatte ry 19 the cabinet has a detachable partition 28 whose bottom end is provided with'pins or studs 29 placed in cavities 30 in the bottom 10. And'the' top end is provided with a finger catch 31 pivoted at 32 and adapted to have one end swung into a cavity 33 in the top 6 of the cabinet. The partition also has an eye-screw- 34 or any other suitable means for taking hold of in removing and replacing the partition. The lower corners of the partition have clearing notches 35 for the circuit wires 23 and 25. Upon the front side of the "partition is suitably mounted a card 36 on which is printed either the Morse telegraph code of which a portion'is shown in Fig. 3 or any other code which the student, wishes to practice. And to enable him to study any or all of such codes I furnish with the device a little book 37 containing general instructions for operating the device and also the various telegraph. codes generally used. This book is made of such a size that it can easily be housed in the cabinet between the partition 38 and the buzzer and switch secured on the cor.

In the operation of the outfit the student places the cabinet upon any suitable support as in Fig. 1, removesthe book 37 looks at the code table 36 and presses on the button 18 for short and long periods as indicated by the dots and dashes of the code, and as he thereby causes the buzzer to make short and long sounds the ear will aid in operating corin the memory the long and short sounds much more readily than if only the silent intervals between sounds of equal lengthwere depended on as heretofore. For each code the pupil wishes .rectly and will also enable the mind to record g v to study he simply finds in the book 37 the page containthe book is placed as shown in Fig. 1 and the door closed as shown in dotted line in said later use. p v

As already stated the device .is preeminently adapted for learning to readthe buzzing sounds used in radio telegraphy.

What I claim is: p

1. In a device of the class described; a. cabi-j net having a doorqhinged at its bottom end'to fold outward to abo-ut'horizontal position, a source of electricity Within the cabiton mounted on the normally inward side of sa d door, and circuit wires connectlng the source of electricity with the switchiand the" i buzzer in sucha manner that When the button is pressed the buzzer will sound.

, K 2. Thestructure specified in claim land a p upon the front side. ofsaid partition.

. 3. The structure specified in c1ai1n 2, and a book containing instructions and several tele= graphic codesnpon:itspages, said book beof a size allowingit to be placed in the in [cabinet in front-of fsaidfipartit-ion, for the purposes set forth; I

"tiThe structure specified in claim-3 and means for locking the door of said cabinet.

5. The structure specified in claim 2.,Qsaid {vertical partition having at itsbottomend net, a buzzer and a switch With a press but-j rigid catches engaging cavities in jthebottom of thejcabinet and at its top end a swingable catch engaging a cavity in the top of the cabinet and means for taking holdof to insert and remove the partition. l

ALBIN LlNDS E- In testimony whereof I afiix my signature. 

